some people who have seen or lived through a shocking‚ scary‚ or dangerous event.” Symptoms could begin to occur within 3 months of the incident‚ or they might not develop until years after. Symptoms include re-experiencing‚ avoidance‚ arousal and reactivity‚ and cognition and mood symptoms. These conditions can become chronic but it is very rare. Re-experiencing symptoms are caused by the person’s own thoughts and feelings. This occurs when something reminds the person of that event‚ usually a
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Introduction: This report required the successful identification of two unknown substances through experimental testing on a selective collection of materials and equipment. For the first substance (which will be either tin or aluminium)‚ two tests shall be done to ensure a decisive and educated decision onto what the substance is. The first step utilizes the dramatic difference in density between the two substances by measuring the volume and mass of the unknown substance. By calculating the volume
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Rheumatoid Arthritis Rheumatoid Arthritis (RA) is a chronic autoimmune disease that causes inflammation of joints leading to hot‚ swollen and painfully restricted movements. RA can also affect other parts of the body such as the eyes or lungs. In the early mornings RA presents as joint stiffness that eases during the day. If left untreated‚ repetitive inflammation often results in joint damage. RA can occur at any age‚ but usually presents in people from 35 to 643. With an estimated half a million
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thermodynamic properties of the equilibrium as it progresses. PROCEDURE: Refer to Manual for CHEM 2701: Chemical Reactivity Experiment 2: Thermodynamics of the Rhodamine β-Lactone Zwitterion Equilibrium‚ pages 28-31. CALCULATIONS/RESULTS: The mass of Rhodamine β-Lactone required to make up the stock solution‚ specified on page 30 of Manual for CHEM 2701: Chemical Reactivity Experiment 2: Thermodynamics of the Rhodamine β-Lactone Zwitterion Equilibrium‚ was calculated in the following way:
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activity series plays a major role in corrosion itself. The activity series is basically an empirical series of metals; in order of reactivity from highest to lowest. Gold being the least reactive at the bottom of the list and lithium being the most reactive at the top of the list. Starting at gold and working up to lithium at the top of the list; the metals increase in reactivity‚ lose electrons more readily to form positive ions‚ corrode more readily‚ require more energy to be
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7. Modelling Polyethylene As mentioned previously‚ PE is one of the most important polymers in the world. ADMET has been used to systematically model commercially relevant polymers‚ specifically PE and copolymers of ethylene and another monomer. ADMET is capable of producing PE with specific sequences of monomer units‚ as well as random copolymers via copolymerization with 1‚9-decadiene. The ability to precisely synthesize these polymers has opened the door to exploring the molecular origins of
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useful to us because of their special properties. Reduction means removal of oxygen or gain of electrons. Carbon is a good chemical reducing agent because it readily combines with oxygen‚ but it is only useful for the metals below it in the Reactivity Series. In the process of electrolysis‚ the positive metal ions in the compound gain electrons to become atoms of the elements. METAL METHOD OF EXTRACTION Potassium Sodium Lithium Calcium Magnesium Aluminium K Na Li Ca Mg Al
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The best way to understand family dynamics is to explore the family tree as per Bowen Family Systems Theory. The attempt is to look for patterns of behavior‚ look for the cut offs‚ resulting in disconnection with the family. A member of the family breaking off and no longer having contact with other members of the family over disagreements find opportunities to break free of the family energy system and start a new for self and one’s family. It disrupts the assigned roles for the family. Re-connecting
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solution made had some type of chemical reactivity. Most solutions changed colors revealing the acidity or alkalinity of a chemical and some exposing the presence of starch. The exception in the change of appearance was the chemicals HCI and phenolphthalein which was in the
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for their free radical scavenging activity and studies on fruits and vegetables also show a relationship between phenolic content and antioxidant activities (Omken et al.‚ 2009). The antioxidant potential of polyphenols arises due to their high reactivity as hydrogen or electron donors‚ which can stabilize and delocalize the unpaired electron and chelate metal ions (Rice-Evans et al.‚ 1997). In agreement with the above report‚ the ethyl acetate fraction (ABE) exhibited the highest phenolic content
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